Add info about enabling metrics to upgrade guide
What does this MR do?
This MR updates the Upgrade Guide for Charts-based installations to make the information about the workaround for the #3198 (closed) Sidekiq pods never become ready, killed by failing liveness checks readily available.
Related issues
Checklist
See Definition of done.
For anything in this list which will not be completed, please provide a reason in the MR discussion.
Required
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Merge Request Title and Description are up to date, accurate, and descriptive -
MR targeting the appropriate branch -
MR has a green pipeline on GitLab.com
Expected (please provide an explanation if not completing)
This is a documentation-only MR.
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Test plan indicating conditions for success has been posted and passes -
Documentation created/updated -
Tests added -
Integration tests added to GitLab QA -
NO. Equivalent MR/issue for omnibus-gitlab opened - This is a Charts-specific item.
Edited by Brie Carranza